/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Changes/MeshPolygroupChange.h
FDynamicMeshGroupEditstores a modification of polygroup IDs on a set of triangles
class FDynamicMeshGroupEdit
int32
GroupLayerIndex
GroupLayerIndex indicates which AttributeSet PolyGroup layer to apply the change to, or if -1, apply to the default on the Mesh
TArray< int32 >
NewGroups
New PolygroupID for each triangle
TArray< int32 >
OldGroups
Old PolygroupID for each triangle
TArray< int32 >
Triangles
IDs of triangles that are modified